Variable displacement swash plate compressor

Abstract

An actuator of a variable displacement swash compressor includes a partitioning body that is movable along the axis of a drive shaft, a movable body that changes the inclination angle of a swash plate, and a control pressure chamber defined by the partitioning body and the movable body. The movable body is moved by drawing refrigerant in the control pressure chamber from a discharge chamber. The swash plate is configured to contact and move the partitioning body as the inclination angle increases.

What is claimed is: 
     
       1. A variable displacement swash plate compressor comprising:
 a housing including a suction chamber, a discharge chamber, a swash plate chamber, and a cylinder bore; 
 a drive shaft rotationally supported by the housing; 
 a swash plate that is rotatable together with the drive shaft in the swash plate chamber; 
 a link arranged between the drive shaft and the swash plate, wherein the link includes a supporting portion that pivotally supports the swash plate, and the link allows for changes in an inclination angle of the swash plate relative to a plane orthogonal to an axis of the drive shaft; 
 a piston reciprocally accommodated in the cylinder bore; 
 a converter that is configured to reciprocate the piston in the cylinder bore with a stroke that is in accordance with the inclination angle of the swash plate when the swash plate rotates; 
 an actuator located in the swash plate chamber, wherein the actuator is capable of changing the inclination angle of the swash plate; and 
 a controller that is configured to control the actuator; wherein 
 the actuator includes 
 a partitioning body arranged on the drive shaft, wherein the partitioning body is movable along the axis of the drive shaft, 
 a movable body arranged on the drive shaft, wherein the movable body includes a coupling portion coupled to the swash plate, and the movable body moves in contact with the partitioning body along the axis of the drive shaft to change the inclination angle of the swash plate, and 
 a control pressure chamber defined by the partitioning body and the movable body, wherein the movable body is moved by drawing refrigerant in the control pressure chamber from the discharge chamber, 
 the swash plate is configured to contact and move the partitioning body as the inclination angle of the swash plate increases, and 
 the movable body is configured to move relative to the partitioning body. 
 
     
     
       2. The variable displacement swash plate compressor according to  claim 1 , wherein the coupling portion and the supporting portion are located at opposite sides of a center of the swash plate. 
     
     
       3. The variable displacement swash plate compressor according to  claim 2 , wherein
 the swash plate includes an abutment portion that contacts the partitioning body, 
 the abutment portion is located at a position separated from the center of the swash plate toward the coupling portion, and 
 the abutment portion contacts the partitioning body when the inclination angle of the swash plate changes from a predetermined inclination angle, which is between a minimum inclination angle and a maximum inclination angle, to the maximum inclination angle. 
 
     
     
       4. The variable displacement swash plate compressor according to  claim 3 , wherein the abutment portion is located between the coupling portion and the supporting portion. 
     
     
       5. The variable displacement swash plate compressor according to  claim 1 , further comprising a movement amount restriction portion located in the control pressure chamber, wherein the movement amount restriction portion restricts a movement amount of the partitioning body. 
     
     
       6. The variable displacement swash plate compressor according to  claim 1 , wherein
 the swash plate includes a ring plate and an abutment portion that projects from the ring plate in a rearward direction, and 
 the abutment portion is configured to contact and move the partitioning body as the inclination angle of the swash plate increases. 
 
     
     
       7. The variable displacement swash plate compressor according to  claim 1 , wherein
 a volume of the control pressure chamber when the inclination angle of the swash plate is at a maximum inclination angle is greater than a volume of the control pressure chamber when the inclination angle of the swash plate is at a minimum inclination angle. 
 
     
     
       8. The variable displacement swash plate compressor according to  claim 1 , wherein
 the inclination angle of the swash plate increases upon an increase in a pressure of the control pressure chamber.